Data Communications; Description Of Functionality; Standard Functionality - Siemens 7SR210 Argus Quick Start Manual

Data Communications

Standard Communications Ports
Communication access to relay functionality is via a front
USB port for local PC connection or rear electrical RS485 port
for remote connection
Optional Communications Ports
2 Rear ST fibre optic ports (2 x Tx/Rx) + IRIG-B port
1 Rear RS485 + IRIG-B port
1 Rear RS232 + IRIG-B port
2 Electrical Ethernet
2 Optical Ethernet
Protocols
IEC60870-5-103, Modbus RTU and optional DNP 3.0
protocols – User selectable with programmable data points
IEC61850 over Ethernet – optional
Ethernet Redundancy: RSTP, HSR & PRP - optional
Data
Event records
Fault records
Waveform records
Measurands
Commands
Time synchronism
Viewing and changing settings

Description of Functionality

With reference to figure 7 and figure 8 'Function Diagrams'.

Standard Functionality

37 Undercurrent
Each element has settings for pickup level and Definite Time
Lag (DTL) delays. Operates if current falls below setting for
duration of delay.
46BC Phase Unbalance/Broken Conductor
Element has settings for pickup level and DTL delay. With the
circuit breaker closed, if one or two of the line currents fall
below setting this could be due to a broken conductor.
46NPS Negative Phase Sequence Overcurrent
Two elements, one DTL and one IDMT, with user settings for
pickup level and delays, will operate if NPS Current exceeds
setting and delay. NPS Current elements can be used to de-
tect unbalances on the system or remote earth faults when a
delta-star transformer is in circuit.
49 Thermal Overload
The thermal algorithm calculates the thermal states from the
measured currents and can be applied to lines, cables and
transformers. Outputs are available for thermal overload and
thermal capacity.
Siemens Protection Devices Limited
50/51 Phase Fault
50 INST/DTL and 51 IDMTL/DTL elements provide overcurrent
protection, each with independent settings for pickup cur-
rent, time-multiplier (51) and time-delays. User can select
IEC or ANSI Time Current Characteristics. The IDMT stage has
a user programmable reset characteristic, either DTL or
shaped current/time reset characteristic, to improve grading
with electromechanical protection.
50G/51G/50N/51N Earth Fault/Sensitive Earth Fault
Two earth fault measurement modes are available. One
mode directly measures the earth current from an inde-
pendent CT, or the residual connection of the 3 line CTs. This
input can be set to be either earth fault or sensitive earth
fault (50G/51G). The second mode derives the earth current
internally from the 3 phase CTs (50N/51N). 50 INST/DTL and
51 IDMTL/DTL elements provide overcurrent protection, each
with independent settings for pickup current, time-multiplier
(51) and time-delays. User can select IEC or ANSI Time Cur-
rent Characteristics. The IDMT stage has a user programma-
ble reset characteristic either DTL or shaped current/time
reset characteristic to improve grading with electromechani-
cal protection.
50BF Circuit Breaker Fail
The circuit breaker fail function may be triggered from an
internal trip signal or from a binary input. Line currents are
monitored following a trip signal and an output is issued if
any current is still detected after a specified time interval.
This can be used to re-trip the CB or to back-trip an upstream
CB. A second back-trip time delay is available to enable an-
other stage to be utilized if required.
60CTS-I CT Supervision
The CTS-I CT Supervision function monitors each phase
current input and operates if any one or two inputs fall
below the setting. The element types have user operate and
delay settings.
64H Restricted Earth Fault - scheme
The measured earth fault input may be used in a 64H high
impedance restricted earth fault scheme. Required external
series stabilising resistor and non-linear shunt resistor can be
supplied.
74TC/CC Trip/Close Circuit Supervision
The trip/close circuit(s) can be monitored via binary inputs
connected in H4/H5/H6 or H7 schemes. Trip/Close circuit
failure raises an HMI alarm and output(s).
81HBL2 Harmonic Block / Inrush Restraint
Where second harmonic current is detected (i.e. during
transformer energisation) user selectable elements can be
blocked.
51c Cold Load
If a circuit breaker is closed onto a 'cold' load, i.e. one that
has not been powered for a prolonged period, this can im-
pose a higher than normal load-current demand on the sys-
tem which could exceed normal settings. These conditions
can exist for an extended period and must not be interpreted
as a fault. To allow optimum setting levels to be applied for
normal operation, the cold load pickup feature will apply
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